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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be021f00a46e63f089396a0836eff6ef85ef10b2b04be6d6d67fe975f5422e8' 
  AND token = 'kv5Rptcsz95wwzXKSeLjlzubvnAX40yIGy/uWO3loVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}